No no no! Haha, the blocking pin is weak alluminum, just cut the middle with some diagonal cutters or a hack saw (it's REALLY easy to cut). That way the push rivet still fills the holes on the side but the gas tube fits. I'll take some pictures and post them in a bit.

If you look at Allizards gun you'll see the holes. If you look at mine it looks just as it would when you bought it.